/* FileSaver.js
 * A saveAs() FileSaver implementation.
 * 1.1.20151003
 *
 * By Eli Grey, http://eligrey.com
 * License: MIT
 *   See https://github.com/eligrey/FileSaver.js/blob/master/LICENSE.md
 */

/*global self */
/*jslint bitwise: true, indent: 4, laxbreak: true, laxcomma: true, smarttabs: true, plusplus: true */

/*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/FileSaver.js */

var saveAs = saveAs || (function (view) {
    'use strict';
    // IE <10 is explicitly unsupported
    if (typeof navigator !== 'undefined' && /MSIE [1-9]\./.test(navigator.userAgent)) {
        return;
    }
    var
		  doc = view.document
		  // only get URL when necessary in case Blob.js hasn't overridden it yet
		, get_URL = function () {
		    return view.URL || view.webkitURL || view;
		}
		, save_link = doc.createElementNS('http://www.w3.org/1999/xhtml', 'a')
		, can_use_save_link = 'download' in save_link
		, click = function (node) {
		    var event = new MouseEvent('click');
		    node.dispatchEvent(event);
		}
		, is_safari = /Version\/[\d\.]+.*Safari/.test(navigator.userAgent)
		, webkit_req_fs = view.webkitRequestFileSystem
		, req_fs = view.requestFileSystem || webkit_req_fs || view.mozRequestFileSystem
		, throw_outside = function (ex) {
		    (view.setImmediate || view.setTimeout)(function () {
		        throw ex;
		    }, 0);
		}
		, force_saveable_type = 'application/octet-stream'
		, fs_min_size = 0
		// See https://code.google.com/p/chromium/issues/detail?id=375297#c7 and
		// https://github.com/eligrey/FileSaver.js/commit/485930a#commitcomment-8768047
		// for the reasoning behind the timeout and revocation flow
		, arbitrary_revoke_timeout = 500 // in ms
		, revoke = function (file) {
		    var revoker = function () {
		        if (typeof file === 'string') { // file is an object URL
		            get_URL().revokeObjectURL(file);
		        } else { // file is a File
		            file.remove();
		        }
		    };
		    if (view.chrome) {
		        revoker();
		    } else {
		        setTimeout(revoker, arbitrary_revoke_timeout);
		    }
		}
		, dispatch = function (filesaver, event_types, event) {
		    event_types = [].concat(event_types);
		    var i = event_types.length;
		    while (i--) {
		        var listener = filesaver['on' + event_types[i]];
		        if (typeof listener === 'function') {
		            try {
		                listener.call(filesaver, event || filesaver);
		            } catch (ex) {
		                throw_outside(ex);
		            }
		        }
		    }
		}
		, auto_bom = function (blob) {
		    // prepend BOM for UTF-8 XML and text types (including HTML)
		    if (/^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(blob.type)) {
		        return new Blob(['\ufeff', blob], { type: blob.type });
		    }
		    return blob;
		}
		, FileSaver = function (blob, name, no_auto_bom) {
		    if (!no_auto_bom) {
		        blob = auto_bom(blob);
		    }
		    // First try a.download, then web filesystem, then object URLs
		    var
				  filesaver = this
				, type = blob.type
				, blob_changed = false
				, object_url
				, target_view
				, dispatch_all = function () {
				    dispatch(filesaver, 'writestart progress write writeend'.split(' '));
				}
				// on any filesys errors revert to saving with object URLs
				, fs_error = function () {
				    if (target_view && is_safari && typeof FileReader !== 'undefined') {
				        // Safari doesn't allow downloading of blob urls
				        var reader = new FileReader();
				        reader.onloadend = function () {
				            var base64Data = reader.result;
				            target_view.location.href = 'data:attachment/file' + base64Data.slice(base64Data.search(/[,;]/));
				            filesaver.readyState = filesaver.DONE;
				            dispatch_all();
				        };
				        reader.readAsDataURL(blob);
				        filesaver.readyState = filesaver.INIT;
				        return;
				    }
				    // don't create more object URLs than needed
				    if (blob_changed || !object_url) {
				        object_url = get_URL().createObjectURL(blob);
				    }
				    if (target_view) {
				        target_view.location.href = object_url;
				    } else {
				        var new_tab = view.open(object_url, '_blank');
				        if (new_tab == undefined && is_safari) {
				            //Apple do not allow window.open, see http://bit.ly/1kZffRI
				            view.location.href = object_url
				        }
				    }
				    filesaver.readyState = filesaver.DONE;
				    dispatch_all();
				    revoke(object_url);
				}
				, abortable = function (func) {
				    return function () {
				        if (filesaver.readyState !== filesaver.DONE) {
				            return func.apply(this, arguments);
				        }
				    };
				}
				, create_if_not_found = { create: true, exclusive: false }
				, slice
		    ;
		    filesaver.readyState = filesaver.INIT;
		    if (!name) {
		        name = 'download';
		    }
		    if (can_use_save_link) {
		        object_url = get_URL().createObjectURL(blob);
		        save_link.href = object_url;
		        save_link.download = name;
		        setTimeout(function () {
		            click(save_link);
		            dispatch_all();
		            revoke(object_url);
		            filesaver.readyState = filesaver.DONE;
		        });
		        return;
		    }
		    // Object and web filesystem URLs have a problem saving in Google Chrome when
		    // viewed in a tab, so I force save with application/octet-stream
		    // http://code.google.com/p/chromium/issues/detail?id=91158
		    // Update: Google errantly closed 91158, I submitted it again:
		    // https://code.google.com/p/chromium/issues/detail?id=389642
		    if (view.chrome && type && type !== force_saveable_type) {
		        slice = blob.slice || blob.webkitSlice;
		        blob = slice.call(blob, 0, blob.size, force_saveable_type);
		        blob_changed = true;
		    }
		    // Since I can't be sure that the guessed media type will trigger a download
		    // in WebKit, I append .download to the filename.
		    // https://bugs.webkit.org/show_bug.cgi?id=65440
		    if (webkit_req_fs && name !== 'download') {
		        name += '.download';
		    }
		    if (type === force_saveable_type || webkit_req_fs) {
		        target_view = view;
		    }
		    if (!req_fs) {
		        fs_error();
		        return;
		    }
		    fs_min_size += blob.size;
		    req_fs(view.TEMPORARY, fs_min_size, abortable(function (fs) {
		        fs.root.getDirectory('saved', create_if_not_found, abortable(function (dir) {
		            var save = function () {
		                dir.getFile(name, create_if_not_found, abortable(function (file) {
		                    file.createWriter(abortable(function (writer) {
		                        writer.onwriteend = function (event) {
		                            target_view.location.href = file.toURL();
		                            filesaver.readyState = filesaver.DONE;
		                            dispatch(filesaver, 'writeend', event);
		                            revoke(file);
		                        };
		                        writer.onerror = function () {
		                            var error = writer.error;
		                            if (error.code !== error.ABORT_ERR) {
		                                fs_error();
		                            }
		                        };
		                        'writestart progress write abort'.split(' ').forEach(function (event) {
		                            writer['on' + event] = filesaver['on' + event];
		                        });
		                        writer.write(blob);
		                        filesaver.abort = function () {
		                            writer.abort();
		                            filesaver.readyState = filesaver.DONE;
		                        };
		                        filesaver.readyState = filesaver.WRITING;
		                    }), fs_error);
		                }), fs_error);
		            };
		            dir.getFile(name, { create: false }, abortable(function (file) {
		                // delete file if it already exists
		                file.remove();
		                save();
		            }), abortable(function (ex) {
		                if (ex.code === ex.NOT_FOUND_ERR) {
		                    save();
		                } else {
		                    fs_error();
		                }
		            }));
		        }), fs_error);
		    }), fs_error);
		}
		, FS_proto = FileSaver.prototype
		, saveAs = function (blob, name, no_auto_bom) {
		    return new FileSaver(blob, name, no_auto_bom);
		}
    ;
    // IE 10+ (native saveAs)
    if (typeof navigator !== 'undefined' && navigator.msSaveOrOpenBlob) {
        return function (blob, name, no_auto_bom) {
            if (!no_auto_bom) {
                blob = auto_bom(blob);
            }
            return navigator.msSaveOrOpenBlob(blob, name || 'download');
        };
    }

    FS_proto.abort = function () {
        var filesaver = this;
        filesaver.readyState = filesaver.DONE;
        dispatch(filesaver, 'abort');
    };
    FS_proto.readyState = FS_proto.INIT = 0;
    FS_proto.WRITING = 1;
    FS_proto.DONE = 2;

    FS_proto.error =
	FS_proto.onwritestart =
	FS_proto.onprogress =
	FS_proto.onwrite =
	FS_proto.onabort =
	FS_proto.onerror =
	FS_proto.onwriteend =
		null;

    return saveAs;
}(
	   typeof self !== 'undefined' && self
	|| typeof window !== 'undefined' && window
	|| this.content
));
// `self` is undefined in Firefox for Android content script context
// while `this` is nsIContentFrameMessageManager
// with an attribute `content` that corresponds to the window

if (typeof module !== 'undefined' && module.exports) {
    module.exports.saveAs = saveAs;
} else if ((typeof define !== 'undefined' && define !== null) && (define.amd != null)) {
    define([], function () {
        return saveAs;
    });
}